CN205384863U - Gamma voltage generation circuit and liquid crystal disply device - Google Patents
Gamma voltage generation circuit and liquid crystal disply device Download PDFInfo
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- CN205384863U CN205384863U CN201620117416.6U CN201620117416U CN205384863U CN 205384863 U CN205384863 U CN 205384863U CN 201620117416 U CN201620117416 U CN 201620117416U CN 205384863 U CN205384863 U CN 205384863U
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Abstract
The utility model discloses a gamma voltage generation circuit and liquid crystal disply device, the gamma voltage generation circuit include: a switch circuit is to n switch circuit, controller, first resistor string and second resistor string, first resistor string concatenates between first power and ground, first resistor string is concatenated by a n+1 resistance and forms, a node has between per two adjacent resistance of first resistor string, the i resistance of first resistor string and the node between the i+1 resistance and i switch circuit link to each other, the second resistor string concatenates between second source and ground, the second resistor string is concatenated by a n+1 resistance and forms, a node has between per two adjacent resistance of second resistor string, the i resistance of second resistor string and the node between the i+1 resistance and i switch circuit link to each other, every switch circuit has a voltage output end. The utility model discloses a gamma voltage generation circuit and liquid crystal disply device can produce the image quality demand of multiunit gamma voltage in order to satisfy different display mode.
Description
Technical field
This utility model relates to Display Technique field, particularly to a kind of gamma voltage generation circuit and liquid crystal indicator.
Background technology
The advantage such as liquid crystal indicator (LiquidCrystalDisplay, LCD) has that image quality is good, volume is little, lightweight, low driving voltage, low-power consumption, radiationless and manufacturing cost are relatively low, occupies an leading position in flat display field at present.It is widely used in the multiple office automations such as desk computer, palmtop computer, personal digital assistant (PersonalDigitalAssistant, PDA), portable phone, TV box and audio-visual equipment.
The display floater of liquid crystal indicator needs the external world to provide gamma (gamma) voltage could show image, the corresponding gamma electric voltage of every single order GTG.A kind of existing gamma voltage generation circuit is as shown in Figure 1, for convenience of description, now illustrating for the gamma voltage generation circuit that can show 14 gray scale images, if display 14 GTGs, then gamma voltage generation circuit is in requisition for exporting 14 gamma electric voltage V1-V14.This gamma voltage generation circuit includes a resistance string 6 being in series by 15 resistance R0-R14, and resistance string 6 is serially connected between power vd D and ground, has a node between the resistance that each two is adjacent, and each node exports a gamma electric voltage V1-V14 respectively.Above-mentioned 14 gamma electric voltage V1-V14 are one group of gamma electric voltage.
In this gamma voltage generation circuit, this power vd D is carried out dividing potential drop and can obtain each gamma electric voltage V1-V14 by the N+1 of this resistance string 6 (15) resistance, the computing formula of each gamma electric voltage V1-V14 is: V1=VDD* (R1+R2+ ...+R14)/(R0+R1+R2+ ...+R14), V2=VDD* (R2+ ...+R14)/(R0+R1+R2+ ...+R14) ... V14=VDD*R14/ (R0+R1+R2+ ...+R14).At present, the demand of liquid crystal indicator image quality is more and more higher, liquid crystal indicator it is frequently necessary to operate under different display patterns, such as wide viewing angle, narrow visual angle isotype, needs the gamma electric voltage of different group under different display patterns.But above-mentioned gamma voltage generation circuit can only produce one group of gamma electric voltage, and uses one group of gamma electric voltage can cause display deviation under different display modes, and therefore above-mentioned gamma voltage generation circuit cannot meet the picture display demand of different display modes.
Utility model content
This utility model provides a kind of gamma voltage generation circuit and liquid crystal indicator, it is possible to produce many group gamma electric voltages to meet the image quality demand of different display modes.
Described technical scheme is as follows:
This utility model provides a kind of gamma voltage generation circuit, comprising: the first on-off circuit will show the display pattern of picture to the n-th on-off circuit, acquisition and produce corresponding control signal to the controller of each on-off circuit, the first resistance string, the second resistance string according to described display pattern；Described first resistance string is serially connected with between the first power supply and ground, described first resistance string is formed by n+1 resistance concatenation, between each two adjacent resistor of described first resistance string, there is a node, node and the i-th on-off circuit between i-th resistance and the i+1 resistance of described first resistance string are connected, described second resistance string is serially connected with between second source and ground, described second resistance string is formed by n+1 resistance concatenation, between each two adjacent resistor of described second resistance string, there is a node, node and the i-th on-off circuit between i-th resistance and the i+1 resistance of described second resistance string are connected, each on-off circuit has a voltage output end, wherein, i=1 ... n, i, n is the integer be more than or equal to 1.
In an embodiment of the present utility model, each on-off circuit includes the first transistor, transistor seconds, the grid of described the first transistor is connected with described controller, first end of described the first transistor is electrically connected the node between the i-th resistance and the i+1 resistance of described first resistance string, second end of described the first transistor is electrically connected to the i-th voltage output end, the grid of described transistor seconds is electrically connected to described controller, first end of described transistor seconds is electrically connected to the node between the i-th resistance and the i+1 resistance of described second resistance string, second end of described transistor seconds is electrically connected to the i-th voltage output end, wherein, i=1 ... n, i, n is the integer be more than or equal to 1.
In an embodiment of the present utility model, described the first transistor and described transistor seconds are field effect transistor.
In an embodiment of the present utility model, the first end of described the first transistor and described transistor seconds is source electrode or the drain electrode of transistor, and correspondingly, the second end of described the first transistor and described transistor seconds is drain electrode or the source electrode of transistor.
In an embodiment of the present utility model, described controller is time schedule controller.
In an embodiment of the present utility model, described display pattern includes narrow visual angle, wide viewing angle pattern.
In an embodiment of the present utility model, described first power supply and described second source are DC source.
In an embodiment of the present utility model, total n of described on-off circuit.
In an embodiment of the present utility model, described control signal can be high level signal or low level signal.This utility model provides a kind of liquid crystal indicator, and it includes above-mentioned gamma voltage generation circuit.
The technical scheme that this utility model embodiment provides has the benefit that
By when needs set difference group gamma electric voltage, utilize controller to control on-off circuit switching and can realize the change of gamma electric voltage, to form two groups of gamma electric voltages separate, non-interfering, thus same display device possesses organizes gamma electric voltage more, disclosure satisfy that the multi-functional needs of display device, and the liquid crystal indicator making this gamma voltage generation circuit of employing all can reach good display effect under different display modes, it is to avoid use user's perception that same group of gamma electric voltage causes uncomfortable before and after the switching of display pattern.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand technological means of the present utility model, and can be practiced according to the content of description, and in order to above and other purpose of the present utility model, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, describe in detail as follows.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of existing gamma voltage generation circuit；
Fig. 2 is the circuit diagram of the gamma voltage generation circuit that this utility model embodiment provides.
Detailed description of the invention
For further setting forth that this utility model is reach technological means and effect that predetermined utility model purpose is taked, below in conjunction with accompanying drawing and preferred embodiment, to according to the gamma voltage generation circuit that the utility model proposes and its detailed description of the invention of liquid crystal indicator, structure, feature and effect, describe in detail as after.
Relevant of the present utility model aforementioned and other technology contents, feature and effect, can clearly present in following cooperation describes in detail with reference to graphic preferred embodiment.By the explanation of detailed description of the invention, when can be reach technological means that predetermined purpose takes and effect is able to more deeply and concrete understanding to this utility model, but institute's accompanying drawings is only to provide reference and purposes of discussion, not it is used for this utility model is any limitation as.
First embodiment
Fig. 2 is the circuit diagram of the gamma voltage generation circuit that this utility model embodiment provides.Refer to Fig. 2, described gamma voltage generation circuit includes controller the 20, first resistance string 21, the second resistance string 22 and multiple on-off circuit 23, and multiple on-off circuits 23 are n, is followed successively by the first on-off circuit to the n-th on-off circuit.
Wherein, controller 20 can connect the relevant image processor in display device, and controller 20 obtains the display pattern that will show picture, and produces corresponding control signal to each on-off circuit 23 according to the display pattern obtained.Such as, display pattern includes narrow visual angle, wide viewing angle isotype, and control signal can be high level signal or low level signal etc..Controller 20 can be time schedule controller etc..
First resistance string 21 is serially connected with between the first power vd D1 and ground, first resistance string 21 is formed by n+1 resistance (the first resistance R0 to (n+1)th resistance Rn) concatenation, there is between each two adjacent resistor of the first resistance string 21 node, total n node, respectively primary nodal point A1 to n-th node An.Node between i-th resistance and the i+1 resistance of the first resistance string 21 is connected with the i-th on-off circuit in on-off circuit 23, wherein, and i=1 ... n, i, n are the integer be more than or equal to 1.First power vd D1 can be DC source.
Second resistance string 22 is serially connected with between second source VDD2 and ground, second resistance string 22 is formed by n+1 resistance (the first resistance G0 to (n+1)th resistance Gn) concatenation, there is between each two adjacent resistor of the second resistance string 22 node, total n node, respectively primary nodal point B1 to n-th node Bn.Node between i-th resistance and the i+1 resistance of the second resistance string 22 is connected with the i-th on-off circuit in on-off circuit 23, wherein, and i=1 ... n, i, n are the integer be more than or equal to 1.Second source VDD2 can be DC source.
Each on-off circuit 23 has a voltage output end, respectively the first voltage output end U1 to n-th voltage output end Un, and each on-off circuit 23 includes transistor Q1 (the first transistor), transistor Q2 (transistor seconds).The grid of transistor Q1 is connected with controller 20, first end of transistor Q1 is electrically connected the node between two adjacent resistors (such as the i-th resistance Ri-1 and i+1 resistance Ri) of the first resistance string 21, and second end of transistor Q1 is electrically connected to the i-th voltage output end Ui.The grid of transistor Q2 is electrically connected to controller 20, first end of transistor Q2 is electrically connected to the node between two adjacent resistors (such as the i-th resistance Gi-1 and i+1 resistance Gi) of the second resistance string 22, second end of transistor Q2 is electrically connected to the i-th voltage output end Ui, i=1 ... n, i, n are the integer be more than or equal to 1.For first on-off circuit 23, the grid of the transistor Q1 of first on-off circuit 23 is connected with controller 20, first end of the transistor Q1 of first on-off circuit 23 is electrically connected the node A1 between the first resistance R0 of the first resistance string 21 and the second resistance R1, and second end of the transistor Q1 of first on-off circuit 23 is electrically connected to the first voltage output end U1.The grid of the transistor Q2 of first on-off circuit 23 is electrically connected to controller 20, first end of the transistor Q2 of first on-off circuit 23 is electrically connected to the node B1 between the first resistance G0 of the second resistance string 22 and the second resistance G1, and second end of the transistor Q2 of first on-off circuit 23 is electrically connected to the first voltage output end U1.
Above-mentioned transistor Q1, Q2 can be field effect transistor, and first end of above-mentioned transistor Q1, Q2 can be source electrode or the drain electrode of transistor, and correspondingly, second end of above-mentioned transistor Q1, Q2 can be drain electrode or the source electrode of transistor.
The operation principle of this utility model gamma voltage generation circuit is as follows: when the display pattern that controller 20 acquisition will show picture is narrow field-of-view mode, then controller 20 produces a control signal (such as high level signal) to each on-off circuit 23, transistor Q1 conducting in each on-off circuit 23, transistor Q2 cut-off in each on-off circuit 23, after first power vd D1 is carried out dividing potential drop by n+1 the resistance (the first resistance R0 to (n+1)th resistance Rn) of the first resistance string 21, gamma electric voltage u1-un is exported by the voltage output end U1-Un of each on-off circuit 23, this gamma electric voltage u1-un is first group of gamma electric voltage.
When the display pattern that controller 20 acquisition will show picture is wide viewing angle pattern, then controller 20 produces a control signal (such as low level signal) to each on-off circuit 23, transistor Q1 cut-off in each on-off circuit 23, transistor Q2 conducting in each on-off circuit 23, after second source VDD2 is carried out dividing potential drop by n+1 the resistance (the first resistance G0 to (n+1)th resistance Gn) of the second resistance string 22, exporting gamma electric voltage v1-vn, this gamma electric voltage v1-vn by the voltage output end U1-Un of each on-off circuit 23 is second group of gamma electric voltage.Above-mentioned two groups of gamma electric voltages are separate, do not interfere with each other, so that same display device possesses organizes gamma electric voltage more, disclosure satisfy that the multi-functional needs of display device, and make the liquid crystal indicator all can reach good display effect under different display modes, it is to avoid before and after the display pattern switching of existing display device, to use user's perception that same group of gamma electric voltage causes uncomfortable.
This utility model additionally provides a kind of liquid crystal indicator, including above-mentioned gamma voltage generation circuit.
In sum, the gamma voltage generation circuit of the present embodiment offer and liquid crystal indicator, when needs set difference group gamma electric voltage, utilize controller to control on-off circuit switching and can realize the change of gamma electric voltage, separate to form two groups, non-interfering gamma electric voltage, thus same display device possesses organizes gamma electric voltage more, disclosure satisfy that the multi-functional needs of display device, and the liquid crystal indicator making this gamma voltage generation circuit of employing all can reach good display effect under different display modes, avoid the user's perception using same group of gamma electric voltage to cause before and after the switching of display pattern uncomfortable.
The above, it it is only preferred embodiment of the present utility model, not this utility model is done any pro forma restriction, although this utility model is disclosed above with preferred embodiment, but it is not limited to this utility model, any those skilled in the art, without departing within the scope of technical solutions of the utility model, when the technology contents of available the disclosure above makes a little change or is modified to the Equivalent embodiments of equivalent variations, in every case it is without departing from technical solutions of the utility model content, any simple modification above example made according to technical spirit of the present utility model, equivalent variations and modification, all still fall within the scope of technical solutions of the utility model.
Claims (10)
1. a gamma voltage generation circuit, the first on-off circuit it is characterized in that, comprising: will show the display pattern of picture to the n-th on-off circuit, acquisition and produce corresponding control signal to the controller of each on-off circuit, the first resistance string, the second resistance string according to described display pattern；Described first resistance string is serially connected with between the first power supply and ground, described first resistance string is formed by n+1 resistance concatenation, between each two adjacent resistor of described first resistance string, there is a node, node and the i-th on-off circuit between i-th resistance and the i+1 resistance of described first resistance string are connected, described second resistance string is serially connected with between second source and ground, described second resistance string is formed by n+1 resistance concatenation, between each two adjacent resistor of described second resistance string, there is a node, node and the i-th on-off circuit between i-th resistance and the i+1 resistance of described second resistance string are connected, each on-off circuit has a voltage output end, wherein, i=1 ... n, i, n is the integer be more than or equal to 1.
2. gamma voltage generation circuit according to claim 1, it is characterized in that, each on-off circuit includes the first transistor, transistor seconds, the grid of described the first transistor is connected with described controller, first end of described the first transistor is electrically connected the node between the i-th resistance and the i+1 resistance of described first resistance string, second end of described the first transistor is electrically connected to the i-th voltage output end, the grid of described transistor seconds is electrically connected to described controller, first end of described transistor seconds is electrically connected to the node between the i-th resistance and the i+1 resistance of described second resistance string, second end of described transistor seconds is electrically connected to the i-th voltage output end, wherein, i=1 ... n, i, n is the integer be more than or equal to 1.
3. gamma voltage generation circuit according to claim 2, it is characterised in that described the first transistor and described transistor seconds are field effect transistor.
4. gamma voltage generation circuit according to claim 2, it is characterized in that, first end of described the first transistor and described transistor seconds is source electrode or the drain electrode of transistor, and correspondingly, the second end of described the first transistor and described transistor seconds is drain electrode or the source electrode of transistor.
5. gamma voltage generation circuit according to claim 1, it is characterised in that described controller is time schedule controller.
6. gamma voltage generation circuit according to claim 1, it is characterised in that described display pattern includes narrow visual angle, wide viewing angle pattern.
7. gamma voltage generation circuit according to claim 1, it is characterised in that described first power supply and described second source are DC source.
8. gamma voltage generation circuit according to claim 1, it is characterised in that total n of described on-off circuit.
9. gamma voltage generation circuit according to claim 1, it is characterised in that described control signal can be high level signal or low level signal.
10. a liquid crystal indicator, it is characterised in that it includes gamma voltage generation circuit as claimed in any one of claims 1-9 wherein.
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| CN201620117416.6U CN205384863U (en) | 2016-02-05 | 2016-02-05 | Gamma voltage generation circuit and liquid crystal disply device |
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| CN201620117416.6U CN205384863U (en) | 2016-02-05 | 2016-02-05 | Gamma voltage generation circuit and liquid crystal disply device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106384579A (en) * | 2016-08-31 | 2017-02-08 | 深圳市华星光电技术有限公司 | Gamma reference voltage generation circuit and liquid crystal display panel |
| CN106409256A (en) * | 2016-11-03 | 2017-02-15 | 昆山龙腾光电有限公司 | Gamma voltage generation circuit and liquid crystal display device |
| CN106847217A (en) * | 2017-03-03 | 2017-06-13 | 昆山龙腾光电有限公司 | Gamma voltage generation circuit, liquid crystal display device and driving method |
| CN107369427A (en) * | 2017-09-21 | 2017-11-21 | 昆山龙腾光电有限公司 | A kind of gamma voltage generation circuit and liquid crystal display device |
| CN108962180A (en) * | 2018-09-19 | 2018-12-07 | 昆山龙腾光电有限公司 | Gamma switching circuit and liquid crystal display device |
| CN109448647A (en) * | 2018-12-03 | 2019-03-08 | 昆山龙腾光电有限公司 | View angle switch framework, method and liquid crystal display device |
| CN112419995A (en) * | 2020-11-30 | 2021-02-26 | 成都中电熊猫显示科技有限公司 | Gamma driving circuit for liquid crystal display device and liquid crystal display device |
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2016
- 2016-02-05 CN CN201620117416.6U patent/CN205384863U/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106384579A (en) * | 2016-08-31 | 2017-02-08 | 深圳市华星光电技术有限公司 | Gamma reference voltage generation circuit and liquid crystal display panel |
| CN106384579B (en) * | 2016-08-31 | 2019-03-12 | 深圳市华星光电技术有限公司 | Gamma reference voltage generation circuit, liquid crystal display panel |
| CN106409256A (en) * | 2016-11-03 | 2017-02-15 | 昆山龙腾光电有限公司 | Gamma voltage generation circuit and liquid crystal display device |
| CN106409256B (en) * | 2016-11-03 | 2019-04-05 | 昆山龙腾光电有限公司 | A kind of gamma voltage generation circuit and liquid crystal display device |
| CN106847217A (en) * | 2017-03-03 | 2017-06-13 | 昆山龙腾光电有限公司 | Gamma voltage generation circuit, liquid crystal display device and driving method |
| CN106847217B (en) * | 2017-03-03 | 2019-11-19 | 昆山龙腾光电有限公司 | Gamma voltage generation circuit, liquid crystal display device and driving method |
| CN107369427A (en) * | 2017-09-21 | 2017-11-21 | 昆山龙腾光电有限公司 | A kind of gamma voltage generation circuit and liquid crystal display device |
| CN108962180A (en) * | 2018-09-19 | 2018-12-07 | 昆山龙腾光电有限公司 | Gamma switching circuit and liquid crystal display device |
| CN108962180B (en) * | 2018-09-19 | 2020-11-24 | 昆山龙腾光电股份有限公司 | Gamma switching circuit and liquid crystal display device |
| CN109448647A (en) * | 2018-12-03 | 2019-03-08 | 昆山龙腾光电有限公司 | View angle switch framework, method and liquid crystal display device |
| CN112419995A (en) * | 2020-11-30 | 2021-02-26 | 成都中电熊猫显示科技有限公司 | Gamma driving circuit for liquid crystal display device and liquid crystal display device |
| CN112419995B (en) * | 2020-11-30 | 2022-07-08 | 成都中电熊猫显示科技有限公司 | Gamma driving circuit for liquid crystal display device and liquid crystal display device |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: InfoVision Optoelectronics(Kunshan)Co.,Ltd. Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |
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